This is a set of three antique Japanese navy sake cups, made of pewter and each decorated with an insignia of the Japanese navy. The words on the back of each of the cups are "Showa 7th Year Shanghai Incident Participation Commemoration" "15th Destroyer Flotilla". There's also a maker's mark in the center of each cup. The Japanese navy was instrumental in helping land troops and bombard shore positions during the brief war in Shanghai in early 1932.